UP FOR DISCUSSION: - Talking Golf (the German version, not Scottish) - BMW Makes More Fiber; GM More Batteries: Why? - What Have Car and Driver and the Detroit Free Press Been Driving? SPECIAL GUEST: Jim Campbell, U.S. VP, Performance Vehicles and Motorsports, GM - Mr. Campbell has a Corvette C7.R in tow. What technologies and tricks will it pass on to future production vehicles? All that and more with Gary Vasilash, Automotive Design and Production; Mark Phelan, Detroit Free Press; and Jeff Sabatini, Car and Driver